Effect of standoff distance on the kerf characteristic during abrasive water jet machining

Abstract

The aim of this research is to elucidate the effects of the standoff distance (SOD) in abrasive water jet machining (AWJ) on mild steel. Nine different standoff distances (z) of 5, 8, 10, 11, 15, 18, 20 and 25mm AISI 1090 steel samples were used in this study. Following the test, the kerf width and kerf taper ratio were measured. The surface morphology characteristics of the machined surface were investigated using a scanning electron microscope (SEM). The results revealed that the ratio of kerf taper increased as the standoff distance and kerf width increased. Compared to the 15mm standoff distance, 8 mm at the jet entry and exit exhibited more uniformity in kerf appearance. Both 8 and 15mm standoff distances showed that the surface roughness gradually became rougher towards the jet exit.